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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0488d34c1bcc0178a48750dd4e80c75ac282052a75d544464b1d12158a47574d' 
  AND token = 'nX2pLqQI3QxiRoiWk+Yz7YrYs0JFFY8ZP2PAGcaDLVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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