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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c887ffe118070a97c4bab0a8c9d78853e4bfad2d509e2e11090e486422b86124' 
  AND token = 'jL/vfsts7CwHToTbiv/HxU8E1MYj6ss3x9ucN2Q3qus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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