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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e38c45219e9bbc45fbffa23ecca2f03c91d43fea498fdfbe5c9fa542136d31' 
  AND token = 'yXevqgxyPlumvhVJmjl16+U0Ac0kmbN97ROdSBpHpk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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