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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ac9d116790d3f46111e9c807d47c8b53baf880648acf6bfa96dc96659153a7' 
  AND token = 'IUrulNLrj4+gc+0hseMGNRdqOv0e3tXBedRtzmeXor8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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