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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35a9ccc9128fe91f7154da33b4b39eaf91fd746775c56f3aab5b2932d924005' 
  AND token = 'EyOAfb6r8mm00oVi9q/JuD4WiYTZsJDMuOBQuLMnkm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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