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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff317ad4a7b4667eb5878e4b7367bd013d5bea7b021cb3d7b2465f6af2005f1' 
  AND token = 'aNT1Jl1HB1ydlw68QqqZRb/4MTaBiFI+ZUI2CZCKgtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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