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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a849c4f4c39eca685b1ee09a4972117a1db46a56f4e243d7b7c928651c52358c' 
  AND token = 'y6DRrg9sD5Sj63eXV6iZtRJhnBB76Mw/cIVXf7SHJ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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