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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcb5a5008b36b862a0b46b538226fdded321db6b278d475a3dbd4b4255b7d2d' 
  AND token = 'MI0XPtS5kBfmApStreblrKj0tkP7TY3HrfxTK60JoYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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