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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5520a44658f395a0a97f3063cd866b975a798524accc93ef93fdb6fe4fe572' 
  AND token = '2K9tWtg4nSpwRGlzc5yBGSrD9pdCxBhlMpgC0ET2bFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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