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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbfd925a3d1b54152fdad060c30fbbd61133933023538f0ac571c131c05b73e' 
  AND token = 'CeDXq5EUunXVcmNdO0I2aQuZY0gTcNDUcvz+GYbebVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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