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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bfc77d23fb0cac259167b5e01af90867e05ffa7ba1aeaa9d352bddf5d16476' 
  AND token = 'z3BrJk3YwSwA/dzVWb+oLblSqEdlwyjc0U28herRCqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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