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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd2e671c18626ffe5685e0fb5989c55165f0290af7bbaef51e0536ec390a575' 
  AND token = 'strCXFKnLYb5ZB6tAp+HQoPtqX/NgdJrmS5a5Id3XdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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