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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd458102a08596acfd3adaa5e1c9b4b47cd2fa5027374ee65908805d5d130e215' 
  AND token = 'gjfuLux7P2ClgP4rS/uOcP/lXgp+zoNVbh7b25IBz8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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