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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caccaabcac06b3d61a082c291d621c4288836b76a3fac40b30b7c43fc27252d' 
  AND token = 'zrHSXOM7xl8zfvD0AFwmkulNvOnglOR7L/A7MERZNt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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