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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1353ad1a2a637033501401b8b48d4fb673fc40e05e0c88422d5e87df0d2eb52' 
  AND token = 'EljKFCNTmAyoiewIk9o6oF/pN0nsQqvl7EKm0kO2gy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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