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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b0d0dffb587acb39edd10cf7ffb026d1434c4d617488ba4c38f46b9afa43c2' 
  AND token = 'Yzgii1Z6sF/y70Dy2+vrZu6/VwHkH9gX7wz2/OaLMac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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