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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c7801c96ca428873ae68d20dac420ce138c44898cfcfaec9f83af0530d0132' 
  AND token = 'tL2/D7EgVVmOnoShLfb0c2ZpiyV/xqxqY4+UGlv9JRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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