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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b69e8bf8787628592341f7fb0db39f6a02c289e7a3eb0dbdf98b04872a63c3' 
  AND token = 'LZcvt9vCdw08L2oULXAbxNJ4JTcawz8DUV6G+nYlVb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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