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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f51ab0e3d205ec494242a814449c5c23e3f9d42c659662f95fe25dfa4a94b6' 
  AND token = 'Cs7FH7zPDm8V1jml2qhjsZ09eqMHY2ERwxU07Jg41jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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