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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1feeab0450bac4ea92625aff01a7c9e7d2ea3ad8694a1b964775ec7e7ee2eb1' 
  AND token = 'H2J7iBftgjwSSFuSYzWMnEUne89SybPuEE/4onodGcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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