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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cb24921077bb0449e7975a3aebbe03ebbac667df9d3aa25bf59cd771aa7137' 
  AND token = 'NXtSb/Pzo54RIGEHum1JbTgcvCzTXJpZvt+FX5xZIs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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