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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca32788f811255a0972c9e9c41127eaa8683b3e34bf22fd22d608ee938e2a446' 
  AND token = 'f7RwMw/qkpl3coSB40mwALNH16ogOa4CN9WM4ZwkZuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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