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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f092f533f4e3a3e28a5084d13b2e2183eba083766766f58c16334c60f54474d4' 
  AND token = 'ufeqziPbIimi6p5lfPGiqw/hWD6ubqns3PoLcoDiMpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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