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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86c88d2b6cc0bdafdfbd931b7b15526b928635b22a23fbed481824e091266ce' 
  AND token = 'fi4BNqIy9XSo3ErIc4eQlxhFDWmr9HHFHEXZvAOj2p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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