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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772a5729d9f69dee8b0d886777aa5c05a959ae6cd9a60e0011be4b4ea645079b' 
  AND token = 'dT5mVOYauz15tok2DWRApDBer+7xrS5E64mNy+6asms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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