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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e86dc749848971c99725622fa141f805c64c5a073683396e99ee65a8d178be' 
  AND token = 'qsGVJhm2mZ3y/esaFuB11A9M1ZITO0tWjV9T512k4W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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