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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00eeffdc0a61a9c10e8f95b2074d2be30253a0197b6fd1426f4d1110a1c8b3fb' 
  AND token = 'SkxxpcFv1SzLZw7pJ3orOQXs95412cKFPuhZt8BaKcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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