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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7f9bb21419181aea5782e77ffabe56f50272d978d83732850a872b3d859b95' 
  AND token = 'ME386whFJ4GqI2kiUXorBaE5B33QlMtK1e7QK8c99X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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