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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8f3e228872e844df1137f2f05f4834205139c5bba9852335de240c78eb3c89' 
  AND token = 'UCtGdxcgERrNcRQf5CLJ4wGfmoQtkiDiARti8yD+Z5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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