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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128344dd9e49480a3dd842e215efaf054f47c660d4430d2e9d3d059570c9035e' 
  AND token = 'bdICPYMdaP/1wqJJewR8JNejbG+NlnFypJ9Ie+Tw6YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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