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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc99fc495db86802e8cd8644ca993522f5e5ec941f2de839c83a7e69d6c4fe4d' 
  AND token = 'XE8+0ksLeLcBfcZwwvTeof/BXCmbo8wFISqdixYANWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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