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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a91fd217a2b72ed90df07463fdb405b07ad9751d13bfd8c3bf5649ecf029d8' 
  AND token = 'emggDiQgLVdQSgeXeoD85WuEA9Gt15TLWvcT9aR+iog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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