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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d7eea88e2a3b269651f6351aa7a6c1a4847727202e61884ab8547956f6e5fa' 
  AND token = 'Lz7c8Dd2eSqlhmM63drKPkZhglTzOVHJGwr6/jIk0mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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