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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f15f8e4791f82a0af2739cb23e3ea10e699aa348ec8fc496b25631f11ec5c56' 
  AND token = 'J1/dPplZluha4Exlnp9clawUhHnSeuXBqmv6w4tZoxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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