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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b62b07a6e9f1b12a08c163ec8f9102be338ce55868e78877f6f783a31d5b02' 
  AND token = 'ESAn1Zc/egRr2I16NrGuqK4NH+u/mW/inh+9M4Pqr44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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