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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e6e3794771c07f1dfeed57cbe58b5e38b856ed92bd4e707248756c340c1d7a' 
  AND token = 'Bhpvo4jZ/4dgrGZ5TrO7otahMmTACvY3BX/GRtDEbv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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