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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e85af5f21d00a5aabbae2241e85b187bbeefe64c5c52a1f829b4f68a7a8800b' 
  AND token = 'a0tYffGLujGOuywa7RYeM0bCcOwv+G5Mu9+tYDGaKMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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