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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e13595d4e8447167ad5f1136a56f9371a635aa71514cf3813007b74b66b2fca' 
  AND token = 'KdRd+Dy5QUmoVnFmwr7JGbT+aSK3vgDIU71ETjQEVlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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