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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ecdec62ff01ee2d4e0682b6122fbf13103d17e17f22402d3c34e1decc036cc' 
  AND token = 'sotsWDnqROPstyEw44F+pzctchdIIFZM7J+YtJVpZFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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