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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71095dbf90b57915fbc651f6dae1e737f9da4dc3f7af4defc1e5650604b2dff0' 
  AND token = 'nCqvMfKxRI4phFRo9GtCsnfPDfNPHH8HVP66z6Fxwoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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