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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea86a9558efaa527c4f3827b6a8d4a849bca4b72526abd538c28e949b6e6cf1' 
  AND token = 'Edk6EQ483K+8CQYdTCdL91b/9YuvMLqxRNJKJDf89ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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