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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae9010bcba43c878c9af63f692f902522364b95a4e63baddf3077ec7245b5f9' 
  AND token = '1i3pugHH3ErITV4dXYNErzflpI8nvona4Wgxo3aUwas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}