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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14055fc9f853b57af79ce1665d0fa82ce7e64d8ec0e2918ada1a142518d3e4c2' 
  AND token = 'NzhSURVYGmh8U3CMZtoVMbRobZtNRD/FZ2BED5eiO8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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