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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690258b68b3d94ed0d6b090a0d8af7575e5f2b987de9289c4d73f78b42ef80e0' 
  AND token = 'FDu9DeiAEqoale1J+dWs3ogQzYcnthWGwUKTonNBWKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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