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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50814f6b6f07c6a7aacd93e752c0c3b998d46a1389910b02a9eab465d3b79ea7' 
  AND token = 'tfihPTdarZ5RblEmocQ9e1nfii75i5RcsL9ZjNv+mEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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