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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9507d7928ea23df34aa2db13d21b012d8aeae7aadf604d2f651e29d984359478' 
  AND token = 'qPBICrq/evhePOcgQ01MCLmpK72m6q/41kPYPE11c8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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