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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fef77ffcc9879f26348cb947b7252f8c167145796d400ac4a9677d83916d77' 
  AND token = '5yubehLb8R3rWaVG1NPbfv26CakiGEElW/b5uCLBz2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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