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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45002085c75abef45395462db23b26c0ce216e542af48205edb600397560a095' 
  AND token = 'DaWeFNAUEoioBp3NasYlJUk6zLZOHHou/1DTChjCPMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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