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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e95bbb60aec6f5875593cd7bde76b1c7981799ffe52157afef8ba958c6ecce' 
  AND token = 'FPar9tnP0Qlgz4KZBVq2xJTsX1if6NIMGsqfEasNFc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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