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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90a5b077954c5f035160ac1f59a69d71440b35650136508487019d42bf419c4' 
  AND token = 'DBsU7vauqnO5ZoPsvjIcZRzVi8O6b1JiTCuSt89r0cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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