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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5256e793ddae122fae2a18cd3c1ce3d4d3c61c4f3993402d33984c5f4d8e3b7' 
  AND token = 'Nrg/z3q5uobGLGFddeuFmEZR3IqtOXVrX/VGo5OhAFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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