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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30f3bd21d2e2500e61fa821873a0d739f468862072cc1827edb03697326dd9e' 
  AND token = 'aNIHZ1XEYlBPijR2pJ+NIBQfiasiADtXF3J0R726Ksc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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