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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d414e7c7899b8a7315fb05ce1796505b6129d2d4c65097f70b628a4bb994c8' 
  AND token = 'uOPVy8yDo1RP56uzq54ElQM+l/3grPINmhQR2U1KBFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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