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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df284dc50bf218eaadf4528e4ffb3383e72b1f3bc0495b4b6940c0e57ca925e' 
  AND token = 'x/Ao18HXfAGaBOzV6rG+fcnFypd/BeKZFx/Psn4sS2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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