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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896f700746571c887cb1ddabd2efbcfd7aa9f6b27b61946d6cf91ced9cdbd217' 
  AND token = 'Gg8uvcJrGdhCHP9ObbqE0KEVesewCW5oM0xUjVBjdHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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