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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd175c5d887036ac8e50c2fe832773343e6724a3dd584d02f53508a2ed9c67cb' 
  AND token = '0r77vPLS2/YskDOqU4GbWW9Ine4H27GruXXAofgXVEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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