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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7d34c0cd9e367ad50f8605f33c4aef4586fb59218eca3dd9acdffae0bd1936' 
  AND token = 'gouRuaJ5D9OwUqI8x+1hrSgV3PA2zK2NlYPULyO7+AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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